Threshold and saturation properties of the field-induced twist cell with two parameters weak anchoring boundaries
Guan Rong-Hua (关荣华)ab, Sun Yu-Bao (孙玉宝)b
a Department of Applied physics, North China Electric Power University, Baoding 071003, China; b Department of Applied Physics, Hebei University of Technology, Tianjin 300130, China
Abstract On the basis of two-parameter formula of weak surface coupling anchoring energy of nematic liquid crystals proposed by Zhao et al recently, the general torque equilibrium equation and boundary conditions of the director have been obtained and the threshold field as well as the saturation field of the field-induced twist cell have been analysed for three kinds of configurations, i.e. homogeneous, splay and Pi cells formed by different rubbing conditions and pretilt angles. The results indicated that the polar anchoring has no effect on the threshold field. It is determined only by the twist anchoring and pretilt angle. But, the polar anchoring and twist anchoring are coupling with each other and have a great influence on the saturation field. The formulae for calculating the threshold field and saturation field are given. These results will be very useful in understanding surface physics and the design of liquid crystal cells.
Received: 10 November 2005
Revised: 24 February 2006
Accepted manuscript online:
Fund: Project supported by the Theoretical Physics Special Foundation of the National Natural Science of China (Grant No 10447107),the Natural Science Foundation of Hebei Province, China (Grant No A2006000675), the Doctoral Foundation of Hebei Province, China (
Cite this article:
Guan Rong-Hua (关荣华), Sun Yu-Bao (孙玉宝) Threshold and saturation properties of the field-induced twist cell with two parameters weak anchoring boundaries 2006 Chinese Physics 15 1041
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